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of Clinical Research Findings: Therapeutic and Historical Aspects David M. Novick, Mary Jeanne Kreek, Don C. Des Jarlais, Thomas J. Spira, Elizabeth T. Khuri, Jayanthi Ragunath, V. S. Kalyanaraman, Alvin M. Gelb, and Annatina Miescher 318 The Effects of Cannabis Use on the Clinical Condition of Schizophrenics Juan C. Negrete and Werner P. Knapp 321 A Stage Model of HTLV-111/LAV Infection in Intravenous Drug Users Don C. Des Jarlais, Samuel R. Friedman, Thomas J. Spira, Susan Zolla-Pazner, Michael Marmor, Robert Holzman, Donna Mildvan, Stanley Yancovitz, Usha Mathur-Wagh, Jonathan Garber, Wafaa El-Sadr, Henry Cohen, Donald Smith, and V. S. Kalyanaraman 328 Effects of Cocaine on Pregnancy Outcome Ira J. Chasnoff, William J. Burns, Sidney H. Schnoll, and Kayreen A. Burns 335 Disparity in Hemispheric and Thalamic Growth in Infants Undergoing Abstinence Matthew E. Pasto, John Deiling, Leonard J. Graziani, Saundra Ehrlich, and Loretta P. Finnegan 342